On panic, this macro will print the values of the expressions with their
debug representations.

Unlike assert_ne!, debug_assert_ne! statements are only enabled in non
optimized builds by default. An optimized build will omit all
debug_assert_ne! statements unless -C debug-assertions is passed to the
compiler. This makes debug_assert_ne! useful for checks that are too
expensive to be present in a release build but may be helpful during
development.